gemgui 0.5.1

GUI application library
Documentation 
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<!doctype html>
<meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate, max-age=0" />
<meta http-equiv="Pragma" content="no-cache" />
<meta http-equiv="Expires" content="0" />
<meta charset="UTF-8">
<html lang="en">
    <head>
        <meta charset="utf-8">
        <style>
            #some_tests_header {
                color:red;
                font-size:32px
            }
            </style>
        <title>Tests</title>
    </head>
    <body>
        <h2 id="some_tests_header" name="some_name">Some Tests</h2>
        <script type="text/javascript" src="gemgui.js"></script>
        <button id="startbutton">Calc!</button>
        <div id="content" class="some_class">
            Lorem ipsum, vino veritas
        </div>
        <div id="another_content" class="some_class">
            <p id="paramount">Fellow</p>
            Yellow
            <p>Follow</p>
        </div>
        <div>
            <canvas id="canvas" width="500" height="500"></canvas>
        </div>
        <img id="hidden_image" src="widgets.jpeg" alt="hidden for canvas" hidden/>    
        <script>
            function add_mut_observer(observed, event_name) {
            const targetNode = document.getElementById(observed);
            console.assert(targetNode, observed + " not found");
            // Options for the observer (which mutations to observe)
            const config = {attributes: true};
            const callback = function(mutationsList, observer) {
                console.info("Mutation lists CB");
                for(let mutation of mutationsList) {
                    if (mutation.type === 'attributes') {
                        const targetNode = document.getElementById(observed);
                        console.info("Send sendGemGuiEvent", event_name, targetNode.id);
                        const obj = {}; 
                        for (const attr of targetNode.attributes)
                                obj[attr.name] = attr.value;
                        sendGemGuiEvent(observed, event_name, obj);
                    }
                }
            };
    
            // Create an observer instance linked to the callback function
            const observer = new MutationObserver(callback);
            // Start observing the target node for configured mutations
            observer.observe(targetNode, config);
        }
        add_mut_observer('content', 'test_event');
        </script>
    </body>
</html>